Magmortar is used by Veteran Rosaline in Pinwheel Forest and Waitress Jan in Celestial Tower (1F, source).
Electivire is used by Veteran Sinan in Pinwheel Forest (source).
No trainer in Black 2 uses Skitty (source).
No trainer in Black 2 uses Buneary (source).
Leafeon is used by Waitress Bonita on Route 3, Veteran Rosaline in Pinwheel Forest, and, in the summer, N at N’s Castle (2F, the ruins, source).
No trainer in Black 2 uses Rufflet (source).
No trainer in Black 2 uses Vullaby (source).
Mandibuzz is used by Ace Trainer Kathrine outside of Pinwheel Forest and Veteran Cecile on Victory Road (1F, source).
No trainer in Black 2 uses Trapinch (source).
Klang is used by Scientist Dudley in the Laboratory (P2) and Scientist Franklin in the basement of the Dreamyard (source).
No trainer in Black 2 uses Roserade (source).
Pinsir is used by Backpacker Reece on Route 14, Veteran Murphy in Lostlorn Forest, and Black Belt Martell on Victory Road (the cliff side, source).
Drifloon is used by Psychic Lynette in the Strange House (1F, source).
No trainer in Black 2 uses Shuppet (source).
Vulpix is used by Lass Shannon on Route 3 and Lady Elizandra in the Royal Unova Cabin (source).
Ninetales is used by N in the summer in N’s Castle (2F, ruins, source).
Bronzong is used by Boss Trainer Ellas in Black City (source).
Beldum is used by Preschooler Tyrone on Route 3 (source).
Metang is used by Colress at the Helm Giant Chasm Entry of the Plasma Frigate and by Psychic Al on Victory Road (1F, source).
Metagross is used by Maid Tammy in Celestial Tower (4F), Caitlyn from the Elite 4, Colress at the Deck P2 Lab Entry at the Plasma Frigate, and Colress at the Helm P2 Lab Entry at the Plasma Frigate (source).
Slakoth is used by Youngster Keita at the main portion of the Dreamyard (source).
Vigoroth is used by Pokémon Ranger Rick on Route 1 (source).
Slaking is used by Youngster Keita at the main portion of the Dreamyard (source).
Corphish is used by Fisherman Eustace at the Moor Of Icirrus (source).
Crawdaunt is used by Youngster Keita inside of Pinwheel Forest and Roughneck Fletcher in Nimbasa City (source).
Lickitung is used by Nursery Aid Autumn on Route 3, Linebacker Dan in Nimbasa City, and School Kid Sally in Nimbasa City (source).
Lickilicky is used by School Kid Rita in the main portion of the Dreamyard and Game Freak Nishino in Castelia City (source).
No trainer in Black 2 uses Yanmega (source).
Hope this helps! :)